My guess: Perhaps this is a bug, or alternatively, a known issue that won't
be addressed because to do so would be a breaking change.
There is an old demo of Clojure given by Rich where MapEntry's were printed
using some sort of un-readable notation #<:foo 5>. But clearly MapEntry's
have been revised to act a lot like 2-element vectors.
user=> (rseq (first (mapv identity {:foo 5})))
(5 :foo)
user=> (conj (first (mapv identity {:foo 5})) :x)
[:foo 5 :x]
user=> (assoc (first (mapv identity {:foo 5})) 1 7)
[:foo 7]
user=> (subvec (first (mapv identity {:foo 5})) 0 1)
[:foo]
FWIW, ClojureScript behaves in your expected way:
(empty (first (mapv identity {:foo 5})))
=> []
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